Originally Posted by alostpacket
I had a problem like this as well would be curious to hear what ended up happening for you.
Google got back to us, they've confirmed that some of the reviews were dodgy and have been removed, and asked us to let them know if it happens again. I don't know if they've contacted the chap in question, or removed his reviews from the other games he downrated in order to promote his own title.
RedToasty also contacted the chap directly to warn him to that we'd informed Google so he should cease and desist his activities. The guy denied all knowledge, but hopefully the fact he's been called out on it and Google has acted means that he'll stop now.
In short, it's definitely worthwhile contacting Google through the Android Market support. Androlib.com is very useful in spotting these fake reviews - when you spot that the person saying your game isn't as good as game X has done four reviews, one for game x giving it 5 stars and saying it's the best game ever, then another four identically worded 1 star reviews to other games in the same genre, it's pretty damning!
If you know who it is who's doing it, it's also worth contacting them directly. It might be that they've just been... over-enthusiastic in promoting their own game and haven't really given much thought of the impact they're having on the people behind the titles they're targeting.